I've kept my computer fairly locked down. I recently got a Sonos system and I'm having some issues:
I can get both Zone Players to see the remote and the PC software sees them fine. However, they do not show up anywhere as UPnP devices. I made sure both UPnP "services" were active (I had previously manually disabled them).
I reinstalled the Netbios protocol.
I don't think I have any ports blocked or anything in my router.
I'm using ZoneAlarm (free) and Rhapsody works fine - but it won't show up in the Sonos app or on the remote